Is requiring a dependency in requirejs really asynchronous?

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if I define a module with requireJS like this.

define(function(require){

 var x = require("y");

  //do something with x

});

Why is it possible to use x instantly after requiring it? I thought require collects the dependencies asynchronous? I have heard that requirejs calls toString() on the callback function and parse it to find require statements to collect the dependencies before calling the callback. Is this correct?

asked 1 min ago

Christian

363